正常增殖活动旺盛的细胞,可出现染色体断裂而成为无着丝点的染色体断片,当细胞有丝分裂进入后期,这种无着丝点的断片不能被纺锤体向两极牵引,也不被纳入子核内,仍游离于胞浆中,至有丝分裂完成后进入闻期,染色体断片遂变成小的核团块,称微核(亦叫卫星核)。正常人微核率很低,但在长期小剂量电离辐 Normal proliferative activity of the cells, there may be chromosomal rupture and no filamentous chromosome fragments, when the cell into the later stages of mitosis, the filamentous fragment can not be spindle to the poles traction, nor is it included in the nucleus , Still free from the cytoplasm, to mitochondria into the smell after completion, chromosome fragments then become small nuclei, said the micronucleus (also known as satellite nuclear). Normal micronuclei rate is very low, but in the long-term low-dose ionizing radiation